impoverished

I am dammed
dammed for a reservoir
my waters are low
my fishways are gradually
declining

I am impoverished
my watershed is overused
I am impounded for
hydroelectricity
in several places

I am dangerous
contaminated by
metals from Pittsfield
plumes of contaminated sediment
exit from my mouth

I am silty
I am difficult to navigate
because of the sandbar
there is no major city
near my mouth

I am short, tidal, turbid
there is zinc-65 in my oysters
I have only three crossings
I was formerly known as
the Pequot